zero initialise WaveformWs in ca transport

Author: James Souter

src/fastcs/transport/epics/ca/util.py

@@ -1,6 +1,5 @@
 from dataclasses import asdict
 
-import numpy as np
 from softioc import builder
 
 from fastcs.attributes import Attribute, AttrR, AttrRW, AttrW
@@ -45,17 +44,17 @@
 
 def record_metadata_from_attribute(
     attribute: Attribute[T],
-) -> dict[str, str | None]:
+) -> dict[str, str | object | None]:
     """Converts attributes on the `Attribute` to the
     field name/value in the record metadata."""
-    metadata = {"DESC": attribute.description}
+    metadata: dict[str, str | object | None] = {"DESC": attribute.description}
     initial = None
     match attribute:
         case AttrR():
             initial = attribute.get()
         case AttrW():
             initial = attribute.datatype.initial_value
-    if np.any(initial):
+    if initial is not None:
         metadata["initial_value"] = cast_to_epics_type(attribute.datatype, initial)
     return metadata
 

tests/transport/epics/ca/test_initial_value.py

@@ -105,8 +105,7 @@ async def test_initial_values_set_in_ca(mocker):
                 18,
                 19,
             ],
-            # waveforms are not zero initialised currently
-            "SOFTIOC_INITIAL_DEVICE:WaveformW": [],
+            "SOFTIOC_INITIAL_DEVICE:WaveformW": 10 * [0],
             "SOFTIOC_INITIAL_DEVICE:Waveform_RBV": [0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
         }.items():
             assert np.array_equal(value, initial_values[name])